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In how many stages the treatment of waste-water in STPs is carried out?

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in Biology – Class 12 by (271k points)
In how many stages the treatment of waste-water in STPs is carried out?

(a) One

(b) Two

(c) Three

(d) Four

The question was asked in an interview.

This intriguing question originated from Microbes in Sewage Treatment topic in portion Microbes in Human Welfare of Biology – Class 12

1 Answer

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Best answer
Correct choice is (b) Two

To explain: The treatment of waste-water in STPs is carried out in two stages namely primary treatment and secondary treatment. Treatment of waste-water is done by the heterotrophic microbes naturally present in the sewage.

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